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Cellulolytic enzyme system of Trichoderma koningii. Separation of components attacking native cotton.

ABSTRACT: 1. Cell-free culture filtrates from Trichoderma koningii were concentrated by precipitation with ammonium sulphate between the limits of 20% and 80% saturation. 2. Removal of a low-molecular-weight carboxymethylcellulase (CM-cellulase) component by chromatography on Sephadex G-75 had no effect on the ability of the enzyme complex to solubilize cotton. 3. Further chromatography on DEAE-Sephadex separated a component (C(1)) from the C(x) (CM-cellulase) and beta-glucosidase activities. Separately these components had little ability to produce soluble sugars from cotton, but when recombined in their original proportions this capacity was almost completely recovered. 4. The C(x) component was further fractionated on SE-Sephadex into a fraction containing only CM-cellulase and a fraction showing CM-cellulase and beta-glucosidase activities: the latter two components could be separated by heat treatment. 5. The C(1) component had no swelling factor (S-factor) activity (Marsh, Merola & Simpson, 1953; Reese & Gilligan, 1954) on its own, but it had a synergistic effect on the S-factor activity associated with the CM-cellulase and beta-glucosidase components.

SUBMITTER: Wood TM

PROVIDER: S-EPMC1186778 | biostudies-other | 1968 Sep

REPOSITORIES: biostudies-other

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Project description:BackgroundCellulolytic enzymes produced by Trichoderma reesei are widely studied for biomass bioconversion, and enzymatic components vary depending on different inducers. In our previous studies, a mixture of glucose and disaccharide (MGD) was developed and used to induce cellulase production. However, the enzymatic profile induced by MGD is still not defined, and further optimization of the enzyme cocktail is also required for efficient ethanol production from lignocellulosic biomass.ResultsIn this study, cellulolytic enzymes produced by T. reesei Rut C30 using MGD and alkali-pretreated corn stover (APCS) as inducer were compared. Cellular secretome in response to each inducer was analyzed, which revealed a similar enzyme profile. However, significant difference in the content of cellulases and xylanase was detected. Although MGD induction enhanced β-glucosidase production, its activity was still not sufficient for biomass hydrolysis. To overcome such a disadvantage, aabgl1 encoding β-glucosidase in Aspergillus aculeatus was heterologously expressed in T. reesei Rut C30 under the control of the pdc1 promoter. The recombinant T. reesei PB-3 strain showed an improved β-glucosidase activity of 310 CBU/mL in the fed-batch fermentation, 71-folds higher than that produced by the parent strain. Meanwhile, cellulase activity of 50 FPU/mL was detected. Subsequently, the crude enzyme was applied for hydrolyzing corn stover with a solid loading of 20% through separate hydrolysis and fermentation (SHF) and simultaneous saccharification and fermentation, respectively, for ethanol production. Better performance was observed in the SHF process, through which a total of 119.9 g/L glucose was released within 12 h for concomitant ethanol production of 54.2 g/L.ConclusionsThe similar profile of cellulolytic enzymes was detected under the induction of MGD and APCS, but higher amount of cellulases was present in the crude enzyme induced by MGD. However, β-glucosidase activity induced by MGD was not sufficient for hydrolyzing lignocellulosic biomass. High titers of cellulases and β-glucosidase were achieved simultaneously by heterologous expression of aabgl1 in T. reesei and fed-batch fermentation through feeding MGD. We demonstrated that on-site cellulase production by T. reesei PB-3 has a potential for efficient biomass saccharification and ethanol production from lignocellulosic biomass.

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Cellulolytic enzyme system of Trichoderma koningii. Separation of components attacking native cotton.

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